Improvement in machines for stamping sheet-metal ware



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- T. P. AUSTLNL Machines for Stamping Sheet Metal Ware NO; 135 750 Patented Feb. H,1873.

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T. P. AUSTIN.

Machines for Stamping Sheet Meial Ware.

PatehtedFeb.11,1873.

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have invented a new and useful Improvement in Machines for Stamping Sheet-Metal fare;

chine or apparatus having my invention ap- UNITED STATES THEODORE l. AUSTIN,

IMPROVEMENT IN MACHINES FOR or new YORK, N. v.

STAMPING SHEET-METAL WARE.-

Specifieation forming part of Letters Patent No. 135.750, dated February ll, 1873.

To all whom it may concern! Be it known that I, THEODORE P. A LTSIIN,

of the city, county, and State of New York,

and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing forming part ot this specification, and in which- Figure 1 represents a side elevation of a maplied; Fig. 2, a plan of the same; Fig. 3, an end view of the cylinder-cover with valvechests thereon; Fig. 4, a vertical section 011' the apparatus in part; Figs. 5 .and 6, transverse sections at the lines .r .r and y 3 respectively, of the valves used in the apparatus; and Fig. 7, a plan of the main casting containing the cylinders with the cover thereof removed.

Similar letters or reference indicate corresponding parts.

This invention relates to the press or apparatus for stamping sheet-metal ware, for which reissued Letters Patent No. 4,765 were granted to Villiam D. (.rrimshm and others February 20,1872, (date of original patent being December 1,1S6S,) and in which the sheet-metal plate to be stamped or worked is placed upon a die, and a holding-block carried by a number of pistons is brought down to bear on the margin of the plate outside of and around the hollow of the die. The plate, thus held, is then subjected to the action of a stamp operated by a central or main piston, and arranged to work through the holding-block, to press the por tion of the sheet-metal plate lying over the hollow of the die into the latter. The several pistons were operated by any suitable fluid, but preferably water under pressure of compressed air'in a receiver or reservoir, the operating'flnid being admitted into the cylinders containing the pistons on opposite sides of the latter, and exhausted therefrom, as required, accordingly as the pistons were to be raised or lowered, by means of valves operated by trcadles, and controlling passages in the top plate of the press, and passages connected therewith in eonummication with the ends of the cylinders. The improvement consists in means for operating the press under high and employed for giving the final holding-and pressing action to the pistons, and, if desired, for startin the stain )lll"- )iston back a ain 23 i: O 7

thus ecouomizing the use of a high-pressure fluid in the cylinders, and reducing the cost of working the press accordingly.

A is the bed or table of the press, designed to hold or contain the die on which the plate to be worked is placed. B 1' are pillars, arranged to support the casting O, in which are the main or central cylinder 1), and the surrounding smaller cylinders E E, the latter receiving the pistons 1 F which carry the holding-down block (1-, and the former cylinder 1) having a piston, ll, within it for operating the stamp I, which passes through the holding-down block or ring. J J are the valveboxcs or cases containing the valves for controlling the action of the pistons 1 F and the piston ll, respectively, by means of treadles K K, as herciubet'ore described. The one, ll, of these valves serves to control the plStOlls l 1*, and the other valve, L, the piston 11, by admitting and exhausting the operating i'luid to and from passages in communication with the opposite ends of the cylinders l) and E, respectively, as hereinbciore specified; but these valves LL should each be so constructed as to control the admission of fluid ot' difi'erent pressures to the cylinders l) and E E, as required. To this end they may be variously constructed, and be either cylindrical valves vibrating around a longitudinal axis, or slidevalves, as desired; but the former construction V the reservoirs, is supplied to the press on suit ably operating the valves L L. The low-pressure supply-pi c bis connected with the valvebox J by pipes or branches (I, and with the valve'boxdbypipesorbramchesc /l Thehigh pressure supply-pipe b is also connected with. the valve-box J by a branch, 9, and with the valve-box J bya branch,h. The 'valveL is constructed nearits outer end with across-passage,

i, and exhaust-cavity, 7c, thepassag'ei serving,

when the valve is suitably turned, to pass fluid of a low pressure from the branch cinto an annularpassage, l, and from thence to the cylinders E E onto the underside of the pistons-E F, to raise said pistons and holdingdown block G, carried by them, and the exhaust-cavity k, serving to pass water from be- H branch g to the top of the small pistons F 'F by the annular cavity 0.- The water is exhausted from the tops of the small pistons by the exhaust-cavity q and. outlet-pipe t when it is required to raise the pistons. A similar arrangement ot' passages and cavities in the valve L, and which are referred to by similar letters, serves,iu connection with the branches e fh and outletpipes m and t, to admit successivel y, as required,water of a low pressure and high pressure to the top of the large piston D, or water of a low pressure to the bottom thereof, and. to exhaust from either end of said )istonsc linder as re uired,and accordin l l y 7 g S asthe valve L is turned The supply-pipes b L are fitted with cocks for turning on and. off the water from the high and low pressure reservoirs. The normal positionof the treadles K K is up, and when 'not depressed, and the cocks in the supplypipes b b are open, then water of a low pressure from the reservoir M is ad mitted by the passages i in the valves L L below the pistons F and H, to raise them, the exhaust-cavities qbeing open to the'upper sides of said pistons. .Upon slightly depressing, however, the treadle K the valve L is turned so as to open the exhaust 75 to the bottoms of the-cylinders E E and outlet-pipe m, and at the same time to open the .passage n to the branch at and top of the cylinders E E, thereby bringing down the pistons F F and workclamping ring or block G, by water at a low pressure from the reservoir M. 'A further depression of such treadle K closes this low- .pressure supply, and turns the valve L so as to open the passageq to the vbranch ,g and tops of the cylinders E E, thus giving the final lowering or clamping action to'the holdingdown block G under or by water at a high pressure from the reservoir M. The treadle K is then similarly depressed at intervals to operate the valve L, and cause it, by its passages and cavities, tofirst clear thecylinder D below the piston H of water; also, to introduce above said piston water of a low pressure from the reservoir M, and next, or by the concluding depressing action on the treadle, to admit water of a high pressure from the reservoir M" to finish the descent of the piston H and stamp I, and to give the latter its stamping action on the plate or sheet being worked. Upon removing the foot from either treadle K K the valves L L resume their normal position, exhausting the water from or started then said cock is immediately closed again..

From this description it will be seen that while a powerful action is obtained both for the clamping-block G and stamp I, when in contact with the work, by then using fluid of a high pressure, but little of such high pressure fluidis used in the working of thepress, inasmuch as the general or main action of the pistons F and H, both in rising and falling, is controlled by fluid of a low pressure, and which is produced at a much less cost than fluid at a high pressure. v

What is here claimed, and desired to be secured by Letters Patent, is- I The combination of the high and low pressure fluid-reservoirs M M and valves L L with the cylinders-D E, the pistons F H, the holding-down block or ring G, the stamp I, and

treadles K K ,when said valves are constructed and connected with both reservoirs for suc-- cessive supply of the fluid at different pressa ures during the motion of the pistons, substantially as specified.

THEO. 11. AUSTIN.

Witnesses:

FRED. HAYNES, Faun Tuscrn 

